CN105958203A - Ultra-wide-band wave-trapping antenna - Google Patents

Abstract

The invention provides an ultra-wideband trap antenna, comprising: a substrate, a floor fixed on the lower surface of the substrate, a radiation patch arranged on the upper surface of the substrate, and a feeder connected to the radiation patch; A split resonator ring comprising two circular split rings is provided, and the opening sizes of the two split rings are inconsistent, and the opening directions differ by 180°; groove, wherein the open end of the U-shaped groove is located in the radiation patch, and the open end is provided with a folded edge extending to the inside of the U-shaped groove, and the U-shaped groove and the side of the feeder away from the radiation patch There is a distance between the edge and the left and right edges; it solves the problem that in the prior art, WLAN with a frequency band of 5.15-5.825GHz and a satellite communication system with a frequency band of 7.0-8.5GHz X will affect the ultra-wideband antenna during use .

Description

An Ultra Wideband Notch Antenna

technical field

The invention relates to an antenna, in particular to an ultra-wideband notch antenna.

Background technique

Since the Ultra-wide-band (UWB) 3.1-10.6GHz frequency band was determined to be suitable for civil communication, the UWB communication system has attracted much attention due to its advantages of low power consumption, high bandwidth, and easy design. As an important part of UWB communication system, UWB antenna is widely used because of its good all-radiation characteristics and stable gain.

However, with the rapid development of the communication industry, Wireless-local-area-network (WLAN) and X-band satellite communication systems have been widely used, and their corresponding frequency bands are 5.15-5.825GHz and 7.0-8.5GHz respectively. . These two frequency bands both cover the range of the ultra-wideband frequency band, which will affect the use of the ultra-wideband frequency band communication system.

Contents of the invention

In view of this, the present invention provides an ultra-wideband notch antenna, which solves the influence of the wireless local area network frequency band and the X-band satellite communication system on the use of the ultra-wideband antenna in the prior art.

The present invention provides an ultra-wideband notch antenna. The antenna includes: a substrate, a floor fixed on the lower surface of the substrate, a radiation patch arranged on the upper surface of the substrate, and a feeder connected to the radiation patch;

Technical scheme of the present invention comprises:

A split resonator ring is provided on the floor, and the split resonator ring includes two circular split rings, wherein the two circular split rings are concentric, and the opening sizes of the two split rings are inconsistent, And the opening directions of the two split rings differ by 180°, the split resonant ring is located at a position facing the radiation patch, and there is a distance from the periphery of the floor;

The feeder is provided with a linear U-shaped slot with an opening facing the radiation patch, wherein the open end of the U-shaped slot is located in the radiation patch, and the open end is provided with a U-shaped slot extending to the inside of the U-shaped slot. Turning back the edge, there is a distance between the U-shaped groove and the edge of the side away from the radiation patch and the left and right edges of the feeder.

For the above antenna, preferably, the radiation patch is provided with a linear inverted C-shaped slot on the side close to the feeder line, and the end face of the open end of the inverted C-shaped slot is located between the end face of the open end of the U-shaped slot and the feeder. The wire is between the end faces near the radiating patch end.

For the above antenna, preferably, an elliptical gap is formed between the edge of the upper surface of the substrate and the radiation patch.

For the above-mentioned antenna, preferably, the shape of the feeding line is a rectangle.

For the above antenna, preferably, the feeding line adopts a coplanar waveguide feeding method.

For the above-mentioned antenna, preferably, the shape of the radiation patch is an elliptical racquet.

For the above antenna, preferably, the value range of the substrate length is 23-27 mm, the value range of the width is 23-27 mm, and the value range of the thickness is 0.6-0.9 mm.

For the above antenna, preferably, the material of the substrate is FR-4 epoxy glass fiber board.

For the antenna above, preferably, the shape of the radiation patch is circular.

For the above antenna, preferably, the shape of the two split rings of the resonant ring is square.

The invention provides an ultra-wideband trap antenna, comprising: a substrate, a floor fixed on the lower surface of the substrate, a radiation patch arranged on the upper surface of the substrate, and a feeder connected to the radiation patch; A split resonator ring comprising two circular split rings is provided, and the opening sizes of the two split rings are inconsistent, and the opening directions differ by 180°; groove, wherein the open end of the U-shaped groove is located in the radiation patch, and the open end is provided with a folded edge extending to the inside of the U-shaped groove, and the U-shaped groove and the side of the feeder away from the radiation patch There is a gap between the edge and the left and right edges; it solves the problem that in the prior art, WLAN with a frequency band of 5.15-5.825GHz and a satellite communication system with a frequency band of 7.0-8.5GHz X will affect the ultra-wideband antenna during use .

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1-a is the front view of a kind of ultra-wideband notch antenna of the present invention;

Fig. 1-b is the rear view of a kind of ultra-wideband notch antenna of the present invention;

Figure 2-a is the return loss diagram of the antenna before and after adding C-shaped slots, U-shaped slots and split resonant rings;

Figure 2-b is a schematic diagram of the influence of antennas on standing waves before and after adding C-shaped slots, U-shaped slots and split resonant rings;

Fig. 3 is the influence schematic diagram of the vertical distance L5 of the inverted C _- shaped slot closed end to the open end face of the ultra-wideband trap antenna of the present invention on the standing wave ratio of the antenna;

Fig. 4 is the schematic diagram of the influence of the length L ₇ of the U-shaped slot of the U-shaped notch antenna of the present invention on the influence of the standing wave ratio of the antenna;

Fig. 5 is a schematic diagram of the influence of the opening size g1 _of the inner ring and the opening size g2 of the outer ring _on the standing wave ratio of the antenna in the resonant ring of the ultra-wideband notch antenna of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

With reference to Fig. 1-a and Fig. 1-b, show the structural representation of a kind of ultra-wideband notch antenna, wherein Fig. 1-a is the front view of a kind of ultra-wideband notch antenna of the present invention, Fig. 1-b is this Rear view of the invention of an ultra-wideband notch antenna. The antenna includes: a substrate 1 , a floor 2 fixed on the lower surface of the substrate, a radiation patch 3 arranged on the upper surface of the substrate, and a feeder 4 connected to the radiation patch.

The structure of the antenna is:

The floor 2 is provided with a split resonator ring 5, and the split resonator ring 5 includes two circular split rings, wherein the two circular split rings are concentric, and the openings of the two split rings The size is inconsistent, and the opening directions of the two split rings differ by 180°, the split resonant ring 5 is located at a position facing the radiation patch 3, and there is a distance from the surroundings of the floor 2;

The feeder line 4 is provided with a linear U-shaped groove 6 opening toward the radiation patch 3, wherein the opening end of the U-shaped groove 6 is located in the radiation patch 3, and the opening end is provided with a U-shaped There is a distance between the U-shaped groove 6 and the edge of the side away from the radiation patch 3 and the left and right edges of the feeder line 4 .

In the present invention, by setting the resonant ring on the floor, by adjusting the size of the openings of the two split rings in the resonant ring, the notch of the 7.0-8.5GHz frequency band is realized, by setting the U-shaped slot on the feed antenna, and by adjusting the size of the slot size, to achieve 5.15-5.825GHz notch. And the structure of the present invention is compact, and the size is small and exquisite.

In the present invention, the side of the radiation patch 3 close to the feeder line is provided with a linear inverted C-shaped groove 7, and the end surface of the open end of the inverted C-shaped groove 7 is located between the end surface of the open end of the U-shaped groove 6 and the Between the end faces of the feeder line 4 near the end of the radiation patch 3 .

In the present invention, by setting an inverted C-shaped groove on the radiation patch and adjusting the size of the arc-shaped groove in the inverted C-shaped groove, the trapping of the 3.1-3.9 frequency band is realized. It solves the influence of the Worldwide Interoperability for Microwave Access (WiMAX) on the ultra-wideband antenna during the use of communication in the prior art.

In the present invention, an elliptical gap 8 is formed between the edge of the upper surface 1 of the substrate and the radiation patch.

In the present invention, the shape of the feeder 4 is rectangular.

In the present invention, the feeding line 4 adopts a coplanar waveguide feeding method.

In the present invention, there is a gap 9 between the feeding line 4 and the substrate around the feeding line, forming a coplanar waveguide feeding form.

In the present invention, the radiation patch 3 is in the shape of an elliptical racket.

In the present invention, the substrate is FR-4 epoxy glass fiber board.

In the present invention, the value range of the substrate length is 23-27 mm, the value range of the width is 23-27 mm, and the value range of the thickness is 0.6-0.9 mm.

In the present invention, the most preferred solution is to use a substrate with a length of 25 mm, a width of 25 mm, and a thickness of 0.8 mm.

In the present invention, the shape of the radiation patch is circular.

In the present invention, the shape of the two split rings of the resonance ring is square.

In the present invention, the low-cost FR-4 epoxy glass fiber board is used, the size of the whole substrate is 25×25m ² , and the thickness is only 0.8mm, and the volume of the antenna is greatly reduced by using the printed antenna structure and the coplanar waveguide structure.

In the present invention, for the design of the ultra-wideband notch antenna, the preferred size can be:

The semi-major axis of the elliptical gap 8 is a ₁ =12.2 mm, and the semi-minor axis b ₁ =10.5 mm.

The length of the rectangular feeder line is L ₂ =6.5mm, the width is S=3.0mm, and the distance (that is, the gap 9 ) from the coplanar waveguide radiation patch on the left and right sides of the upper surface of the substrate is g=0.6mm.

Half of the length of the rectangular channel on the closed end of the inverted C-shaped slot on the elliptical racket-shaped radiation patch is W ₅ =5 mm, the width is s ₁ =0.2 mm, and the vertical distance from the closed end of the rectangular channel to the open end L ₅ = 3mm, the distance from the innermost side of the arc groove at the opening end of the inverted C-shaped groove to the outermost edge of the U-shaped groove closest to the arc-shaped groove W ₉ = 1.5mm, the two arcs in the inverted C-shaped groove The width of the groove channel is s ₂ =0.8mm.

The length of the rectangular groove channel on the two top end faces of the U-shaped groove in the opening direction is both W ₆ =0.7mm, and the length of the U-shaped groove back fold 10 is L ₇ =2.0mm. The U-shaped groove is the most The length of the rectangular groove at the left and right sides of the outer edge is L ₆ =4.5mm, half of the length of the closed end of the U-shaped groove is W ₇ =1.0mm, and the width of all rectangular grooves in the U-shaped groove is s ₃ =0.2 mm.

The radii of the inner and outer circles of the inner resonant ring of the resonant ring are R ₃ =3.5mm and R ₄ =3.3mm respectively, the length of the upward opening rectangle is g ₁ =3.5mm, and the radii of the inner and outer circles of the outer resonant ring are respectively For R ₁ =4.2 mm and R ₂ =4.0 mm, the length of the downward open rectangle is g ₂ =1 mm.

With reference to Fig. 2, it is the simulation diagram of the antenna before and after adding C-shaped slot, U-shaped slot and split resonator ring for the present invention, wherein, Fig. 2-a is the antenna return loss diagram before and after adding C-shaped slot, U-shaped slot and split resonator ring , Fig. 2-b is the VSWR result graph of the antenna before and after adding C-shaped slot, U-shaped slot and split resonant ring. It can be seen from the figure that the voltage standing wave ratio of the ultra-wideband notch antenna in the 3.1-10.6GHz frequency band is less than 2. Satisfies the working frequency band of the ultra-wideband antenna. The voltage standing wave ratio of the ultra-wideband notch antenna is greater than 5 in the three frequency bands of 3.1-3.9, 5.15-5.825GHz and 7.0-8.5GHz. It has notch characteristics, so it can completely suppress The Impact of WiMAX, WLAN and X-Band on UWB Antennas.

Referring to Figure ₃ , it shows the influence of the change of the vertical distance L5 from the closed end of the inverted C-shaped slot to the end face of the open end of the inverted C-shaped slot on the notch performance of the antenna, and shows that the inverted C-shaped slot makes the antenna trap in the WiMAX frequency band Wave. It can be seen from the figure that with the change of _L5 , the corresponding central notch frequency also changes significantly. With the increase of _L5 , the first notch frequency band of the antenna gradually shifts to the low frequency band, and the value of standing wave ratio also decreased. Therefore, the notch of different frequency bands can be realized by adjusting the value of _L5 .

Referring to FIG. 4 , it shows the effect of the length L ₇ of the U-shaped groove folded edge of the ultra-wideband notch antenna on the standing wave ratio of the antenna, and shows that it can generate a corresponding notch function in the WLAN frequency band. It can be seen from Fig. 4 that with the increase of L ₇ , the center frequency corresponding to the second notch frequency band of the antenna shows a trend of gradually decreasing. Therefore, the notch of different frequency bands can be realized by adjusting the value of _L7 .

Referring to Figure 5, it shows the influence of the size of the split resonant ring on the standing wave ratio of the antenna, and shows that it produces a corresponding notch function in the X-band satellite communication frequency band. It can be seen from the figure that as the length g ₁ of the upward opening rectangle in the inner resonant ring and the length g ₂ of the downward opening rectangle in the outer resonant ring increase, the frequency band of the third notch of the antenna gradually increases The frequency band is shifted, and the value of standing wave ratio is also reduced. Therefore, the values of the parameters g ₁ and g ₂ can be adjusted to achieve the frequency point that needs to be suppressed, so as to optimize the standing wave ratio characteristics of the high frequency end of the antenna.

In the present invention, with reference to Fig. 3-Fig. 5, it can be seen that the mutual influence between the three notch frequency bands produced by the C-shaped slot, the U-shaped slot and the split resonator ring in the antenna is not great, and the notch bands produced respectively The notch frequency band produced when the wave band and the three exist at the same time does not produce a large offset, and the three have a high degree of isolation. Therefore, by adjusting parameters such as the specific size and position of the C-shaped slot, U-shaped slot, and split resonator ring, the purpose of interfering signals at any three frequency band points within the passband can be achieved, increasing the flexibility of antenna design and use.

In the present invention, the center frequency of the notch frequency band of WiMAX and WLAN can be calculated by following two formulas:

${\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; W</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; A</span>}\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; no</span>}\mathrm{<span\; class="notranslate">\; o</span>}\mathrm{<span\; class="notranslate">\; t</span>}\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}$

${\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; W</span>}\mathrm{<span\; class="notranslate">\; L</span>}\mathrm{<span\; class="notranslate">\; A</span>}\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; no</span>}\mathrm{<span\; class="notranslate">\; o</span>}\mathrm{<span\; class="notranslate">\; t</span>}\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; u</span>}}\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}$

c represents the speed of light in vacuum, ε _r represents the relative permittivity, L _C =2L ₅ +2W ₅ , L _U =2(L ₆ +L ₇ +2S ₃ +W ₇ ). L ₅ , W ₅ are the lengths of the rectangular slot and the circular slot in the C-shaped slot, respectively, L ₆ , L ₇ and W ₇ are the length and width of the rectangular slot in the U-shaped slot, respectively, and S ₃ is the rectangular slot in the U-shaped slot width.

The center frequency _ω0 of the X-band satellite communication system is calculated according to the following formula:

${\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}}\sqrt{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; LC</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}}$

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}}$

Among them, R0 represents a pair of split resonant rings loaded on the floor, the ring radius _R0 is the average value _of R1 and _R3 , L represents the total inductance of the entire split resonator, and _{C0 represents} the total capacitance.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. a kind of ultra-wideband notch antenna, described antenna comprises: substrate, the floor that is fixed on the lower surface of substrate, the radiation patch that is arranged on described substrate upper surface and the feeder that links to each other with described radiation patch; Its characteristic is that A split resonator ring is provided on the floor, and the split resonator ring includes two circular split rings, wherein the two circular split rings are concentric, and the opening sizes of the two split rings are inconsistent, And the opening directions of the two split rings differ by 180°, the split resonant ring is located at a position facing the radiation patch, and there is a distance from the periphery of the floor; The feeder line is provided with a linear U-shaped groove with an opening facing the radiation patch, wherein the open end of the U-shaped groove is located in the radiation patch, and the open end is provided with a U-shaped groove extending to the inside of the U-shaped groove Turning back the edge, there is a distance between the U-shaped groove and the edge of the side away from the radiation patch and the left and right edges of the feeder. 2. The antenna according to claim 1, characterized in that, A linear inverted C-shaped slot is provided on the side of the radiation patch close to the feeder line. between the end faces of the chip ends. 3. The antenna according to claim 1, characterized in that, An elliptical gap is formed between the edge of the upper surface of the substrate and the radiation patch. 4. The antenna according to claim 1, characterized in that, The shape of the feeder is rectangular. 5. The antenna according to claim 4, characterized in that, The feeding line adopts a coplanar waveguide feeding method. 6. The antenna according to claim 2, characterized in that, The shape of the radiation patch is an elliptical racket. 7. The antenna according to claim 1, characterized in that, The value range of the substrate length is 23-27 mm, the value range of the width is 23-27 mm, and the value range of the thickness is 0.6-0.9 mm. 8. The antenna according to claim 1, characterized in that, The substrate is FR-4 epoxy glass fiber board. 9. The antenna according to claim 2, characterized in that, The shape of the radiation patch is circular. 10. The antenna according to claim 1, characterized in that, The shape of the two split rings of the resonant ring is square.